Chemistry, 06.10.2021 17:10 jjcooper05
A sample of limestone (impure calcium carbonate) weighing 0.20g was reacted with 50cm' of 0.10mol dm3
hydrochloric acid.
CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O()
The hydrochloric acid was in excess, and the excess HCl(aq) reacted with 14cm of 0.10 mol dm3 sodium
hydroxide. Calculate the percentage by mass of calcium carbonate in the limestone
Answers: 3
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